Fluid-compressor.



W. V. TURNER/l FLUID COMPBJISSRl APPLICATION FILED AUG'.

Patented May 19, 1914.

wl-rNesszs ffm/@ Qzfywv UNITED "STATES enfreint? WALTER V. TURNER, OF DGEWOOI), PENNSYLVANIA, ASSIGNOR TO THE TESTING- HOUSE AIR BRAKE COMPANY; OF WILMERDING, PENNSYLVANIA, A CGRRAT'EGN oF PENNSYLVANIA.

Specification of Letters Patent.

/ FLUID-SEMPRESSGR.

Patented May 19a wie,

Application led August 8, 1912. Seriali No. 713,541.

To all 'whom 'it may concern.'

Be it known that I, VALTER'VnTURNnR', a citizen of the United St-:ites,residin'g et Edgewood, in the county of Allegheny und State of Pennsylvania, have *invented neur und useful Improvements in Fluid-Coinpressors, of which the following is a, speei iczition. y

This invention relates torfiuid compressors, and more particularly to the fluid compressing cylinder portion.

It luis been found that lubricating oil einy ployed in oilingthe bearing parts of the compressor works into the fluid compressing cylinder from the crunk case elizunber and that the reciprocating movement of the compresser. piston in the cylindercu uses the formation of a layer of oil on 'the cylinder wnll which upon the outward stroke of the piston is carried forward by the pistou so that quite o ring of oil is often present on the fluid side of the piston at the end of its stroke. This oil is then forced out to u, considerable extent with the compressed fluid. Considerable oil isV thus wasted, and the oil in the compressed air is furthermore liable to interere with the proper working of such vulve mechanisms as :ire en'iployed, for example, in connection with fluid pressure bra ies.

The principal `object of my invention to provide ineens for preventing oil collected by the compressor pistou roinl puss- .ing out ,with the compressed lluid.

In the accompanying druwing, Figure l is :LA scctionolvlew of the zur cylinder portion of a, fluid e( mpressor shownig my 1iny provenient applied thereto und Fig. 2 un end view of u. fragment of the air cylinder busli- As shown in Fig. 1 of the 'drawing my improvement is applied t0 n liuid compressor of one ot' the usual types comprising u cylinder l, :in uir compressor piston 2 mounted therein, und cylinder head 3 carrying 'the usuiil inlet und outlet oir vulves.

In the piston bushing 4 :it the outer end ure drilled one or more longitudinal holes 5 having inwardly extending radial grooves f at the extreme outer edge und Joris '7 luding from the inner end of the holes 5 to the bushing' the piston ring the interior bearing face of i-idjucent to the-inner inceof t) :in annular groove 8 is cut in the piston and this groove Ais so located to regu. tcr with the ports 7 when the piston is in 'its extreme outer position. l

l In operation, the oil carried 'forward by the outward movement of' the compressor iston is forcedinto the holes 5 und thence passes through the ports 'l to the ennulur grooif'e 8. The oil is thus conducted te the inner side of the piston. rings und can then wor; beet; between the exterior suruee et' the piston 2 und the bearing surface out bus-tn ing l te the crank chenuber` it will thus be seen that the oil entinined in 'front of the piston i2 iw. carried back to the e unix cose chamber :ind is Consequently vented from passing along with the fluid compressed by the pump. will aise be noieo that this return movement of the oil is uided by the pressure existing ut'i'he` outer faire of the piston. d

l-lziving now described d invention. what l claim new and dente to secure by' liet4 ters Patent, is:-

l. In n ftuid compressor, the combiiu with a compressor cy der und o. p1 therein5 ol ineens returning oil entrain by the piston to the climi: crise side et' piston to thereby prevent the oil from pzissing out with the eoinpreeecd "1' therein having the usuul piston riizips, ports adapted to establish communica:tion troni the taufe of the piston :wound thc pis ton rings upon 1'uo\-' \iiiciit ot' the pieton to its outer position, to thereby provide moons ol" escupe for the oil entreined by the piston.

3. lu :i fluid compressor, the combination with :i compressor cylinder` u pistou therein having; the usual pistou rings und u tzusliingr between the cylinder oud piston, of ports: in suidboshing` for establishing; communiontion from the nir compressing" f piston to the inner sido of the upon movement of ti position, to ther entruined by 'the o ln s. timid compressor, the combination 

